book Maths Puzzle Numerical Ability

(n+2 divided by 2) + (n+1 divided 6)

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book Other Question

I am having trouble with this question, Find the Lowest Common Denominator of

3 7
---- and ------
x^3 xy^4

I think the answer is

xy^4

Am I right, Can someone let me know?
2x+3y=6
4x=6y+3